yes build this box . en Yes its hits loud in a car ( suzuki swift) on this moment it hits a 141 db on dash but the freq is to LOW 141@ 36 hz with the termlab sensorany1 that can tell how too get a freq rise ?thinking to make the rear chamber smaller ?but wil do that that trick .

Whats really fun is if you can play a very low note and the dash clearly moves up and down. There are some songs where my entire dash-steering colum and everything- will just shake at certain notes. Plus, the neighbor kids can hear me roll in from about 1/2 a mile away if I have it cranked...

the suzuki swift is just a project for a friend of mine .trying to get that car loud for dbdrag Bassrace playing with 2 12inch groundzero radioactiveand only 500 watt its already i nice score . My project is something else my ride a subaru vivio realy small car .wil be loaded with a Planet audio BB12dvc and the 1/2 of the WO . but with the full horn .and will get 2250 watt @ 1 ohm on this moment the woofer hits 145.7 vented and i think it will be louder in the WO